Echelon SmartServer 2.2 - Manual (Page 398)

SmartServer 2.2 User’s Guide 399
that of the OFF event in the Day Schedule (200), which occurs at sunrise. Essentially, starting
at sunrise, the Day Schedule locks out events that have priorities lower than 200. It maintains
the lock until the OFF events ends at sundown.
At the end of the morning peak time, the ON_100 event ends, which resets its priority to 255 and
releases its lock on the luminaire’s SNVT_switch data point. This is only relevant if sunrise
occurs after the end of the morning peak time. In this case, the resetting of the data point priority
enables the ON_60 event in the Night Schedule to dim the lights back to 60% and keep them at
that level until sunrise.
2. An ON_100 event with a 210 priority that is scheduled to start at the beginning of the evening
peak time (17:00 in this example) and end at the conclusion of the evening peak time (19:00 in
this example). If or when this event actually occurs depends on the calculated sundown time.

If the start of the evening peak time occurs before sundown, the ON_100 event is not
executed until sundown. This is because the ON_100 event in the Peak Time Schedule has a
lower priority (210) than that of the OFF event in the Day Schedule (200), which does not end
until sundown. Once the OFF event in the Day Schedule ends at sundown, the ON_100 event
is executed and the lights are turned on and fully illuminated to 100%. The ON_100 event is
executed instead of the ongoing ON_60 event in the Night Schedule because its priority (210)
is higher than that of the ON_60 event (220).

If the start of the evening peak time occurs after sundown, the ON_100 event is executed and
brightens the lights from 60% to 100%. This is because the priority of the ON_100 event in
the Peak Time Schedule (210) is higher than that of the current ON_60 event in the Night
Schedule (220). The ON_60 event in the Night Schedule was executed at sundown, when the
OFF event in the Day Schedule ended.

If the end of the evening peak time occurs before sundown, the ON_100 event is never
executed. This is because the ON_100 event in the Peak Time Schedule has a lower priority
(210) than that of the ongoing OFF event in the Day Schedule (200) and is locked out until
the OFF event ends, which it is not scheduled to do until sundown. When the OFF event in
the Day Schedule does end at sundown, the ON_100 event has already expired; therefore, the
only active event, the ON_60 event in the Night Schedule, executes.
.
The following graphic demonstrates the exception schedule with the events of the Day Schedule
(OTE), and the Peak-Time Schedule (OTE).